[英]OpenLayers.source is undefined - Open layers,Open Street map
我打算參考此代碼從lat long值繪制多邊形。 打開圖層3如何以編程方式繪制多邊形?
var polyCoordinates =[[1.300910900488229, 44.28372648003116],[1.3373031124022878, 44.13311552125895],[1.6648330196289067, 44.12030076099872]];
var polygon = new OpenLayers.Geometry.Polygon([polyCoordinates]);
// Create feature with polygon.
var feature = new OpenLayers.Feature(polygon);
// Create vector source and the feature to it.
var vectorSource = new OpenLayers.source.Vector();
// Create the vectorial layer
var vectorLayer = new OpenLayers.Layer.Vector('Vector Layer', {
source: vectorSource
styleMap: new OpenLayers.StyleMap({
'default': OpenLayers.Util.applyDefaults({
strokeWidth: 3,
graphicName: 'triangle',
pointRadius: '${radius}',
rotation: '${angle}'
}, OpenLayers.Feature.Vector.style['default']
),
'select': OpenLayers.Util.applyDefaults({
pointRadius: '${radius}'
}, OpenLayers.Feature.Vector.style['select']
)
})
});
未定義OpenLayers.source顯示為錯誤。 任何幫助,將不勝感激。
這是在OpenLayers 3中執行此操作的正確方法,該API具有與以前版本不同的API。
var polyCoordinates =[
[1.300910900488229, 44.28372648003116],
[1.3373031124022878, 44.13311552125895],
[1.6648330196289067, 44.12030076099872]];
var polygon = new ol.geom.Polygon([polyCoordinates]);
polygon.applyTransform(ol.proj.getTransform('EPSG:4326', 'EPSG:3857'));
// Create feature with polygon.
var feature = new ol.Feature({
geometry: polygon
});
// Create vector source and the feature to it.
var vectorSource = new ol.source.Vector({
features: [feature]
});
// Create the vectorial layer
var vectorLayer = new ol.layer.Vector({
source: vectorSource,
style: new ol.style.Style({
stroke: new ol.style.Stroke({
color: '#eedd00',
width: 3
})
})
});
編輯:如果堅持使用OpenLayers 2,則需要通過線性環創建多邊形。 設置略有不同。 沒有OpenLayers source
需要處理。
var polyCoordinates =[
[1.300910900488229, 44.28372648003116],
[1.3373031124022878, 44.13311552125895],
[1.6648330196289067, 44.12030076099872]];
// Create the polygon via linear ring
var points = [];
for (var i = 0; i < polyCoordinates.length; i++) {
coord = polyCoordinates[i];
points.push(new OpenLayers.Geometry.Point(coord[0], coord[1]));
}
var linearRing = new OpenLayers.Geometry.LinearRing(points);
var polygon = new OpenLayers.Geometry.Polygon([linearRing]);
var srcProj = new OpenLayers.Projection("EPSG:4326");
var targetProj = new OpenLayers.Projection("EPSG:3857");
polygon.transform(srcProj, targetProj);
// Create feature with polygon.
var feature = new OpenLayers.Feature.Vector(polygon);
// Create the vectorial layer
var vectorLayer = new OpenLayers.Layer.Vector('Vector Layer',
OpenLayers.Feature.Vector.style['default']
);
vectorLayer.addFeatures([feature]);
var sitePoints = [];
var coordinates =[{"long":1.300910900488229,"lat":44.28372648003116},
{"long":1.3373031124022878,"lat":44.13311552125895},
{"long":1.6648330196289067,"lat":44.12030076099872}];
var siteStyle = {
label:'ring',
title: 'press to close as a ring',
cursor: "pointer",
fontSize: '8px',
fontColor: '#222',
pointRadius: 10,
fillColor: '#cccccc',
strokeColor: '#444444'
};
var epsg4326 = new OpenLayers.Projection("EPSG:4326");
for (var i in coordinates) {
var coord = coordinates[i];
var point = new OpenLayers.Geometry.Point(coord.long, coord.lat);
// transform from WGS 1984 to Spherical Mercator
point.transform(epsg4326, map.getProjectionObject());
sitePoints.push(point);
}
console.log(sitePoints);
var linearRing = new OpenLayers.Geometry.LinearRing(sitePoints);
var geometry = new OpenLayers.Geometry.Polygon([linearRing]);
var polygonFeature = new OpenLayers.Feature.Vector(geometry, null, siteStyle);
vectorLayer.addFeatures([polygonFeature]);
map.addLayer(vectorLayer);
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